Quote:
Originally Posted by alistairsam
you could easily use a limit switch to indicate when the focuser has reached the end of the tube. the mcu can poll that switch or
you could have a simple optical limit switch as well which can raise an interrupt to the mcu.
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Carefull what sort of limit switch you use. Needs to have accurate repeatibility since focusing can be measured in microns. There are special homing switches, some with diamond tips. Normal optical limit switch accurracy can be affected by ambient light level.